When a project on Kickstarter reaches its goal long before the window of oppurtunity closes.
"Did you see that Kickstarter project for the LizzieBennet Diaries on DVD?"
"Yeah! They reached their goal really quickly, and there's still thirty days left!"
"That was a real quickstarter!"
Mathematics done with a focus on speed of calculation rather than accuracy. This change in priority often results in wild approximations and unvalidated assumptions, leading to low quality answers. Often used in rough-work to check previously calculated answers, or in physics-related pub arguments.
See also, napkinmath.
Red: Quick! How much worse would it be for Venus to crash into the Earth than Mars?
*pause for quickmath*
Blue: Well, Venus has twice the radius, and it's a volume, so... 8. It would be 8 times as bad.
Red: Wow. Science is awesome.